Psidium guajava leaves assisted green synthesis of metallic nanoparticles: a review

Abstract

Background Several attempts have been made for green synthesis of metallic nanoparticles, revealing the significance of plant extracts in reducing metal source to nanoparticles and applications in various domains of science. Main body Psidium guajava (guava) is evergreen, edible fruit-bearing plant, belonging to family Myrtaceae. Its leaves are reported to contain several phytochemicals like tannins, glycosides, terpenes, and triterpenes. This article focus on applications of Psidium guajava leaves extract in fabrication of nanoparticles of various metals like silver, gold, titanium dioxide, zinc oxide, and copper oxide. In respective research attempts, these metallic nanoparticles were evaluated for one or more applications like anti-microbial activity and/or photocatalytic activity. Conclusion Use of polar extract of guava leaves indicated involvement of its polar phyto-compounds in reducing the metal source and stabilizing the nanoparticles. In conclusion, it could be noted that metal nanoparticles have better anti-microbial activity and photocatalytic potential over aqueous leaves extract. Graphical abstract

Dose-dependent biological toxicity of green synthesized silver nanoparticles in rat’s brain

“…It has been observed that plant extract can be used for the green synthesis of metallic nanoparticles depending on the reducing properties of this extract 43 . In the present study, AgNPs were prepared using PGLE.…”

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“…The leaves of plants grow in pairs and opposite to each other, elliptic to oblong, 5-15 cm long x 3-7 cm broad. The leaf is pubescent and veined in the lower part and glabrous in the upper part 16 .…”

Psidium guajava leaf extract mediated green synthesis of silver nanoparticles and its application in antibacterial coatings

“…Plants element likes bulks, roots, fruits and leaves are used typically to synthesize NPs. 10 Moreover, extract of green leaves of various medicinal plants are used as they have significant reducing and capping agents to convert metallic ions to form NPs. Azadirachta indica (neem), Moringa oleifera , Justicia adhatoda , 11 Aloe vera and Psidium guajava ( P. guajava ) etc.…”

“…P. guajava leaf extract contains biochemicals such as polyphenols, carotenoids, terpenoids, flavonoids, tannins and triterpenes could be responsible for the reduction of metal ions to NPs. 9,10 Bose et al prepared AgNPs using P. guajava and investigate their anti-bacterial activity against Gram negative bacterial strain. 9 Sharmila et al 17 demonstrates result for both Gram-negative and Gram-positive bacteria with zone of inhibition less than 10 mm.…”